Learn about vitamin D deficiency symptoms, causes, testing, sunlight exposure, food sources and when supplementation may be needed.
Why Is Vitamin D Important?
Vitamin D plays an important role in calcium metabolism and bone health. Vitamin D status can be affected by sunlight exposure, diet, absorption and other individual factors.
Symptoms
Vitamin D deficiency may be associated with:
- Muscle weakness
- Bone discomfort
- Fatigue
- Reduced bone health
But these symptoms are nonspecific. Feeling tired does not automatically mean you have vitamin D deficiency.
Who may be at higher risk?
Risk can be influenced by:
- Limited sunlight exposure
- Older age
- Certain gastrointestinal conditions
- Malabsorption
- Some medications
- Limited dietary intake
Should everyone take vitamin D?
Not necessarily.
Taking very high doses without medical advice is not harmless. Excess vitamin D can cause abnormally high calcium levels and other complications.
If deficiency is suspected, a doctor may recommend appropriate testing based on your history and risk factors.
What about sunlight?
Sunlight contributes to vitamin D production, but the amount required varies with skin type, location, season, clothing and other factors.
Sun exposure should also be balanced with skin-cancer prevention.
Bottom line
Vitamin D supplements should ideally be used according to individual need rather than simply because fatigue or body pain is present.
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